Generic extending any becomes generic extending unknown

[gportela85]

TypeScript Version: 3.9.2 and 4.0.0 beta (works fine on 3.8.2 and below)

Search Terms: generic extend any unknown

Expected behavior:
This code should compile just fine

Actual behavior:
I get an error saying Property 'error' does not exist on type 'T'. Because currentBaz: T extends unknown instead extends `any.

Related Issues:

Code

class Foo {
 public bar<T extends any>(baz: T[]): void {
 baz.forEach(currentBaz => {
 if (currentBaz.error) {
 console.log(currentBaz.error);
 }
 })
 }
}

Output

"use strict";
class Foo {
 bar(baz) {
 baz.forEach(currentBaz => {
 if (currentBaz.error) {
 console.log(currentBaz.error);
 }
 });
 }
}

Compiler Options

{
 "compilerOptions": {
 "noImplicitAny": true,
 "strictNullChecks": true,
 "strictFunctionTypes": true,
 "strictPropertyInitialization": true,
 "strictBindCallApply": true,
 "noImplicitThis": true,
 "noImplicitReturns": true,
 "useDefineForClassFields": false,
 "alwaysStrict": true,
 "allowUnreachableCode": false,
 "allowUnusedLabels": false,
 "downlevelIteration": false,
 "noEmitHelpers": false,
 "noLib": false,
 "noStrictGenericChecks": false,
 "noUnusedLocals": false,
 "noUnusedParameters": false,
 "esModuleInterop": true,
 "preserveConstEnums": false,
 "removeComments": false,
 "skipLibCheck": false,
 "checkJs": false,
 "allowJs": false,
 "declaration": true,
 "experimentalDecorators": false,
 "emitDecoratorMetadata": false,
 "target": "ES2017",
 "module": "ESNext"
 }
}

Playground Link: Provided

[IllusionMH]

This is intended change Type Parameters That Extend any No Longer Act as any

Also see discussion in that PR #29571

[gportela85]

Andrii Dieiev (@IllusionMH) thanks